According to the ESRB, this game contains: Animated Blood and Violence
Parents don't have much to worry about. Most of the single player game is spent exploring corridors and blasting alien monsters and bad guys, none of it very graphic or detailed. There are no sexual situations, and there is no questionable language. However, be aware that the game is able to be played with other live people online, with voice chat enabled if the player so chooses. The usual caveats about playing with people online apply.
Metroid fans will definitely want to check the game out. Samus does not start the game by losing all of her power ups and abilities (yay!) and having rival bounty hunters is somewhat interesting, even if they are not very well developed. It's also very nice to be able to go into Samus' gunship at will and travel between planets at any time. It's not an RPG, but it's also not the standard Metroid game, either.
Multiplayer fans will be treated to a wide range of options and game modes, but be aware that these are only available if you have friends in the immediate vicinity. If you don't have anyone with a DS to play with, the only mode available for Internet play is a standard four-player deathmatch. It was easy to find opponents and once connected, I could see no discernible lag or technical issues. However, it was very disappointing to find that there were no options to include bots for simulated multi-play. Be aware that if you do not have an Internet connection, it's not possible to play anything but single player.
Deaf and Hard of Hearing gamers will have no problems. All information in the game is relayed via text and pertinent environmental data is usually displayed on the radar, available on the DS's touchscreen. Having some hearing ability might help pick up on activity during multiplayer, but it's not necessary during the adventure.
